2005 trx 450r mods - Honda TRX Forums: Honda TRX 450R Forum

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Old 03-28-2013, 02:46 PM   #1 (permalink)
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Default 2005 trx 450r mods

for christmas i bought my son a 2008 kfx 450r, it came with a curtis sparks full system and the Power Commander. we also think that he replaced the clutch. he will hit about 40 mph at the bottom of 3rd. i was wondering what i could do to keep up with him. he blows me out of the water.
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Old 03-28-2013, 02:55 PM   #2 (permalink)
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is yours all stock
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Old 03-28-2013, 02:59 PM   #3 (permalink)
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pretty much yes i have the hrc end cap and a new sprocket, and have cut open the air box lid. nothing really done to it
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Old 03-28-2013, 03:17 PM   #4 (permalink)
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Stage 2 hotcam full exhaust if your money allows it dasa,sparks,rossier,motoworks even. I know when I first got my bike I went with the stage2 hotcam it really woke it up. And what size sprocket did you change to?
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Old 03-28-2013, 04:45 PM   #5 (permalink)
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X2 on the HC Stage II cam and full exhaust. If you can get your head ported too that really helps. Very noticeable gain.
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Old 03-28-2013, 06:04 PM   #6 (permalink)
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i changed it to a 13 i think its been a while its an 05. what about jets? CDI?

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Old 03-28-2013, 06:20 PM   #7 (permalink)
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Well I stay in NC so I ran 185 main and 45 pilot jet. As far as the Cdi don't worry about changing it. Put that money toward getting a FCR Carb or getting your head ported
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05 TRX450R
41mm FCR Carb
Boyesen QuickShot 2 Accelerator Pump Cover/Keihin FCR NCVQ Needle
R&D Flex Jet Fuel Mixture Screw/K&N Filter
Outerwears/Stage 2 Hot Cam
12:5.1 JE Pro Series Piston/Sparks Ported Head
Updated OEM Crank/Rossier Exhaust
Precision Clamps/Tag Handlerbars
+1 Houser Stem/06+ Swing Arm
GT Thunder XC Linkage/IMS Shifter
14/36 Gearing/Moose Poly Case Saver
T.M. Design Chain Slide

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Old 03-28-2013, 06:55 PM   #8 (permalink)
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The cam is your next thing and hrc or sparks needle I would go with a 182 main and 50 pilot.

Then a full exhaust, many good ones to choose from and some good deals in the for sale section. Esr is probably my favorite dasa has been known to make the max power but its not by much. Sparks, yoshi, hmf, and others are all good.

After that, the head is your next step. A decent rec port should add 3-5 hp a real good job 6-10 ( hp cost money)
While you have the head off bump the compression to 12-1 a good forged piston will be a lot lighter and the 1.5 compression helps as well and still run pump gas.

The bad thing about the 04/05 is that it takes more to run with the other quads then the 06 trx but that is where the bad stops. IMO you have a better quad just give it a little help.

CDI is a waste of money, most will loose power compared to the stock unit.
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Old 03-29-2013, 06:18 PM   #9 (permalink)
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Hey neighbor, Don't waste money on cdi (yet) If you're on a budget, buy a decent used full exhaust and a HCII. The stock header is very restrictive. If you haven't replaced the piston yet, I'm sure it's time. The stock piston is a low comp. slug. Yes, you will need to re-jet. Very easy on an '04/'05 carb.
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Old 03-29-2013, 06:50 PM   #10 (permalink)
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I done both my head porting and hc2 at the same time. Whole different bike
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